Myers, R.J.K. (1978) Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 2. Effect of rate and source of phosphorus fertilizer. Australian Journal of Experimental Agriculture and Animal Husbandry, 18 (93). pp. 564-572.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
Restricted to ICRISAT researchers only |
Abstract
Field experiments were conducted at Katherine, Northern Territory in 1970-1 and 1971-2 to examine responses of dryland grain sorghum to applied phosphorus (P) at different growth stages. In the first, the effect of rate of application up to 100 kg P/ha as triple superphosphate was investigated. Growth responses to P were noted from mid-elongation onwards, but the magnitude of response varied between seasons, being greater in the higher rainfall season 1970-1. Maximum yields of grain were 7.73 t/ha with 50 kg P/ha in 1970-1 and 4.44 t/ha with 100 kg P/ha in 1971-2, which were increases of 49 and 37% respectively over the corresponding no-P treatment. These suggested an increased requirement for P over previous recommendations. P reduced the time from emergence to anthesis from 68 to 60 and from 70 to 63 days in the 2 seasons. About half of the plant P was taken up after anthesis. It was concluded from soil analysis that P-treated plots had an enhanced supply of P throughout the period of crop growth. In a second study, 4 P sources (superphosphate, triple superphosphate, monoammonium phosphate and diammonium phosphate) were compared. With 25 kg P/ha and with constant nitrogen grain yield response followed the order superphosphate > monoammonium phosphate > diammonium phosphate > triple superphosphate in both years. Triple superphosphate tended to give lower dry matter yields and nitrogen and P contents than the other 3 sources.ADDITIONAL ABSTRACT:Field experiments were conducted at Katherine, Northern Territory in 1970-1 and 1971-2 to examine responses of dryland grain sorghum to applied P at different growth stages. In the first, the effect of rate of application up to 100 kg P/ha as triple superphosphate was investigated. Growth responses to P were noted from mid-elongation onwards, but the magnitude of response varied between seasons, being greater in the higher rainfall season 1970-1. Max. yields of grain were 7.73 t/ha with 50 kg P/ha in 1970-1 and 4.44 t/ha with 100 kg P/ha in 1971-2, which were increases of 49 and 37%, resp., over the corresponding no-P treatment. These suggested an increased requirement for P over previous recommendations. P reduced the time from emergence to anthesis from 68 to 60 and from 70 to 63 days, resp., in the 2 seasons. About half of the plant P was taken up after anthesis. It was concluded from soil analysis that P-treated plots had an enhanced supply of P throughout the period of crop growth. In a second study, 4 P sources (superphosphate, triple superphosphate, monoammonium phosphate and diammonium phosphate) were compared. With 25 kg P/ha and with constant N, grain yield response followed the order superphosphate > monoammonium phosphate > diammonium phosphate > triple superphosphate in both yr. Triple superphosphate tended to give lower DM yields and N and P contents than the other 3 sources
| Item Type: | Article |
|---|---|
| Author Affiliation: | Division of Tropical Crops and Pastures, CSIRO, St. Lucia, Queensland, Australia 4067 |
| Subjects: | Plant Production |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 23 May 2012 08:50 |
| Last Modified: | 23 May 2012 08:50 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5663 |
Actions (login required)
 |
View Item |
